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346GHz backward wave oscillations (BWOs) have been considered as a key device for fusion plasma diagnostics, whose development is a joint project under collaboration among Beijing Vacuum Electronics Research Institute (BVERI), University of California Davis (UC Davis) and Lancaster University. In this paper, we report on some progress being made in the development of a 346GHz BWO.
A compact, high performance staggered double grating (SDG) slow wave structure (SWS) circuit has been designed for a 263 GHz sheet beam traveling wave tube amplifier (SB-TWTA) for use in an electron paramagnetic resonance (EPR) spectrometer system being developed at UC Davis under National Science Foundation (NSF) Multidisciplinary Research Initiative (MRI) funding. By adopting a phase matching choke,...
The design of a novel dual-band (Ku/Ka) gyrotron-traveling-wave tube is presented in this paper. As the gain per-unit of the Ku-band is lower than Ka-band’s, three special methods have been adopted: 1) the two input couplers are separated in space; 2) the magnetron injection gun magnetic compression ratio of the Ku-band is greater than Ka-band’s; and 3) the Ku-band beam current and velocity ratio...
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